Which of the Following Pieces of Evidence Best Supports the Sensitive-Period

Which of the following pieces of evidence best supports the sensitive-period hypothesis for language development?

A) Children the world over reach certain linguistic milestones at about the same age, despite cultural differences in the structure of their languages.
B) Children with aphasia often recover their lost language functions without special therapy, whereas adults with aphasia usually require extensive therapeutic interventions.
C) When pidgin languages arise, they are usually transformed into creoles within a single generation.
D) Apes who learn language display little, if any, knowledge of syntax.